Abstract: Heating efficiency is an important performance index of electric kettles, and the test process is greatly affected by factors such as testers' ability, test methods, and test equipment. Discusses the heating efficiency test of the electric kettle from the factors that affect the test and the uncertainty evaluation, the comparison test shows that the water quantity has a great influence on the thermal efficiency of the electric kettle, while the initial water temperature and the end water temperature have little influence on the thermal efficiency of the electric kettle.

Key words: Electric kettles, Heating efficiency, Uncertainty